Improvement in machinery for calendering- and polishing paper



P. GOBURN. MACHINERY FOR GALBNDERING AND POLISHING PAPER.

N0.1os,569. Patnted May s1, 1870.

laittd states Latent chillin.

PHINEHAS GOBURN, 0F EAST WALPOLE, MASSACHUSETTS.

Letters Patent No. 103,569, lated May 3,1, 1870.

IMPROVEMENT IN MACHINERY FOR CALENDERIN G- AND POLISHING PAPER..

The Schedule referred to lx1 these Lettere Patent and making part of thesame.

To all to whom these presents shall come Be it known that I, PHINEHASGOBURN, of East WValpole, in the count-y ot' Norfolk and Commonwealthot' Massachusetts, have made an invent-ion of a novel and usefulImprovement in Paper-Machinery; and do hereby declare the following tobe a full, clear, and exact description thereof, due reference being hadto the accompanying drawing making part ot' this specification, and inwhich- Figure 1 is a front elevation, peut section, and

Figure 2, a transverse section of a calender-roll, so-called, embodyingmy improvement.

This improvement relates to that portion of paper-making machinery whichpolishes or glazes the surface of the paper, as well as condenses itsbulk.

Herctofore this result has been effected by passing the paper, either inacontinuous strip, as manufactured upon the machine., or in sheets,between revolving cylinders under pressure, ,the surface of thesecylinders being in some instances composed of castiroii, and iu othersof paper coiled edgewise about a shaft or body, these latter being verycostly.

The periphery of these i'olls or calenders,7 as they are technicallytermed, soon becomes indented and scored or abraded to sncli an extentas to injure or dislignre the surface ot' the paper, and requires to beoften removed, placed in a lathe, and turned oli" to a smooth surface.

The object of my present improvement, as herein embodied, is to producea calender or polishing-roll which, while imparting a brilliant polishand hard surface to the paper, shall possess the qualities ofcomparative cheapness and durability and requiring little, if any care.

This invention consists in the employment of a series oth long, thinsteel plates of equal size, tixedatone edge, and at regular intervals,to the periphery of a metallic shaft, parallel thronghoutto the axis ofthe latter, and' departing therefrom at a curved tangent, the width ofthese plates, and t-lie nature of the curve described by each, beingsuch that they intersect cach other, and constitute in aggregate acont-inlnous elastic or yielding surface or polishing circumference.

The accompanying drawing represents, at A, a

straight cylindrical metallic shaft.

Within the periphery of this shaft, from end to end thereof, orsubstantially so, and extending entirely about the same, I cut a seriesof saw-kerfs or channels a o, &c., such channels being disposed at equaldistances asnnder, and in parallelism with each other, and in alignmentwith the axis of the shaft.

B B, Ste., denote a series of long, thin, rectangular steel plates oflike size and form, and ot' equal number with the channels a a, 86e.,one edge of such plates extending into one ofthe said channels a af,

until each is supplied, the plates being secured thcre- 4 in bymechanical means', if considered necessary or judicious.

As before premised, the plates or wings B B, Ste., depart or emanatefrom the shaft A at such a curved tangent thereto as to intersect andoverlap oneanother at a very acute angle, by this means producing apractically continuous surface or circumference, which possessesinherent elastic properties, owing to the sliding ot the free end of oneplate upon the curved body of itsneighbor, when subjected to torsive orradial strain. A

In use the above-described roll revolves in contact with or in theneighborhood of a stationaryr bed or another roll, whether of likecharacter or of a solid and inelastic nature, the paper to be polishedor glazed being passed between the two.

Should hard foreign substances lind access between the two rolls, as nowoften occurs, to great damage of the calender7 roll, the elastic oryielding nature of my roll allows them to pass through without injurytothe latter, thus securing one very important advantage over others inuse.

A second advantage of my roll, as herein described, will be found in thefacttliat its circumferential steel plates may be hardened, thus notonly producing a more elfective polishing-surface to act upon the paper,but rendering the plate very durable.

llhird, in addition to the advantageous surface acquired by thehardening of the plates B B, the peculiar drawing motion exerted bytheuiupon the paper has the eiect of imparting, with comparatively littlepressure, a very brilliant and hard polish to the snrface of the latter.

Having thus described the nature, uses, and advantages of my invention,and the' manner in which the saine is te be practically carried ont,

I claim as my invention, and desire to secure by Letters PatentoftheUnited States, the following, to wit:

Claims.

l. A metallic calender roll, for polishing or glazing paper, theperiphery of which is elast-ic or yielding, for purposes herein stated.

2. A ca-lendei"7 roll, for polishing or glazing paper, composed of anaxial shaft or body and series of curved tangential plates or wings,emanating there.- fioni in such mauiicr as to overlap each other, andproduce a practically continuous surface, whereby I produce resultsherein set forth.

3. A calender or polishing roll for paper niachinery, composed of acentral shaft or body anda series ot' hardened steel wings or tangentialplates, substantially as and for thc purpose herein shown and described.

PHINEHAS COBURN.

Witnesses:

H. E. CoBUnN, G. N. CoBURN.

